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Ubuntu 14.04 LTS USN-2545-1: Critical Kernel Security Flaws

ubuntu
Calendar Grey March 24, 2015
Dist Ubuntu Esm H88
Multiple kernel security flaws patched in Ubuntu 14.04 LTS, addressing serious threats from administrative exploits.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-utopic: Linux hardware enablement kernel from Utopic

Details:

A flaw was discovered in the automatic loading of modules in the crypto

subsystem of the Linux kernel. A local user could exploit this flaw to load

installed kernel modules, increasing the attack surface and potentially

using this to gain administrative privileges. (CVE-2013-7421)

A flaw was discovered in the crypto subsystem when screening module names

for automatic module loading if the name contained a valid crypto module

name, eg. vfat(aes). A local user could exploit this flaw to load installed

kernel modules, increasing the attack surface and potentially using this to

gain administrative privileges. (CVE-2014-9644)

Sun Baoliang discovered a use after free flaw in the Linux kernel's SCTP

(Stream Control Transmission Protocol) subsystem during INIT collisions. A

remote attacker could exploit this flaw to caus...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel system update ubuntu linux-lts-utopic administrative exploit

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
  linux-image-3.16.0-33-generic   3.16.0-33.44~14.04.1
  linux-image-3.16.0-33-generic-lpae  3.16.0-33.44~14.04.1
  linux-image-3.16.0-33-lowlatency  3.16.0-33.44~14.04.1
  linux-image-3.16.0-33-powerpc-e500mc  3.16.0-33.44~14.04.1
  linux-image-3.16.0-33-powerpc-smp  3.16.0-33.44~14.04.1
  linux-image-3.16.0-33-powerpc64-emb  3.16.0-33.44~14.04.1
  linux-image-3.16.0-33-powerpc64-smp  3.16.0-33.44~14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

https://ubuntu.com/security/notices/USN-2545-1

CVE-2013-7421, CVE-2014-9644, CVE-2015-1421, CVE-2015-1465

Severity
critical
Lowest
Low
Medium
High
Critical

March 24, 2015

Topics%20covered

Topics Covered

security advisory denial of service kernel system update ubuntu linux-lts-utopic administrative exploit

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-33.44~14.04.1

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